Electric brake.



Patented Feb. I2, 1901.

F. C. NEWELL. ELECTRIC BRAKE. (Application filed May 2, 1900.1

2 Sheetg8haat I.

(No Model.)

WITNESSES:

No. 667,730. Patented Feb. l2, l90l. F. 0. NEWELL.

ELECTRIC BRAKE. (Application filed May 2, 1900. (No Model.)

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WHNESSES:

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FRANK C. NEVVELL, OF ZILKINSBURG, PENNSYLVANIA, ASSIGNOR TO THEWESTINGHOUSE AIR BRAKE COMPANY, OF PITTSBURG, PENNSYLVANIA.

ELECTRIC BRAKE.

SPECIFICATI N forming part of Letters Patent No. 667,730, dated February12, 1901.

Application filed May 2, 1900. Serial No. 15,225. (No model.)

To all whom it may CO ported on the frame 11 of the car-truck. To

Be it known that I, FRANK O. NEWELL, a the cross-piece 12 of thetruck-frame are secitizen of the United States, residing at Wilcured thebrackets 13 and 14. In these kinsburg, county of Allegheny, State ofPennbrackets bearings are provided for the ends 55 sylvania, haveinvented or discovered a cerof the rock-shaft 15, which has a doubletain new and useful Improvement in Electric crank-arm 16 between itsends. The mag- Brakes, of which improvement the following neticbrake-shoe has a projecting plate or arm is a specification. 17 securedthereto, which is also connected My invention relates to electric brakesfor to the crank-arm 16 of the rock-shaft. As 60 cars, and particularlyto that class of brakes shown in the drawings, the plate 17 projects inwhich both wheel-shoes and track-shoes between the crank-arms 16 of therock-shaft are employed. and is provided with a slot 18, through whichThe object of the invention is to provide a the pin 19 passes, whichconnects the two new and improved means whereby the appliarms of thecrank. While I have shown and 65 cation of the rail-shoe will operate toset the described this particular means ofconnection, wheel-shoes whenthe car is running in either other means for connecting the rail-shoewith direction, and my improvement is specially the crank of therock-shaft may be used withadapted to be employed where the space is outdeparting from my invention. A camlimited between the wheels to which itis apshaped piece 20, having two bearing-pins 21 7o plied. In cars whichare provided with a and 22 connecting the two sides thereof, is multipletruck at each end the wheels of one firmly secured on the rock-shaft.This forms pair are usually so close to those of the other what isvirtually a cam with two bearingpair that the amount of space for therailsurfaces, one above and one below the center shoe and theconnections to the wheel-shoes line ofthe rock-shaft, and it is arrangedto 25 is very limited. operate in the slot 23 of the bar 24. The slot Myinvention consists in the combination 23 is made of such shape as tocooperate with of a rail-shoe and connections therefrom to the cam-piece20, and both of the bearing the wheel-shoes in compact form and adaptedsurfaces or pins of the cam engage with the specially to be applied to amultiple truck of bar 24 at the end of the slot, so that the bar 0 acar, the connections being such that the 24 will be moved when the camis oscillated wheel-shoes are set by the operation of the in eitherdirection. The bar 24 is secured to rail-shoe whichever way the car maybe runthe rod 25, which is pivotally connected to ning. the brake-beam26 of the wheel-shoes 27 of In the drawings, Figure l is a plan view thelarge wheels of the truck. These wheel- 5 showing adouble orfour-wheeled truck with shoes are suspended by links 28 from the myimprovement applied thereto. Fig. 2 is truck-frame. The rod 25 is alsoprovided a longitudinal sectional view taken on. the with two branches29 and 30, the former beline B B of Fig. 1. Fig. 3 is a transversesecing connected to the beam 32, which carries tional view taken on theline A A of Fig. 2. the wheel-shoes of the other or small pair of 0 40Fig. 4 is a detail sectional view taken on the wheels of the truck, andthe latter being conline C O of Fig. 3, and Fig. 5 is a perspectivenected to hand brake-lever 36 of the car. View of the rock-shaft. Thebrake-shoes 31 of the wheels 7 are sus- I have shown my improved brakedevice pended by links from the cross-beam 12 of applied to amaximum-traction truckthe truck-frame and are connected together 45 thatis, one having one pair of large wheels 6 by brake-beam 32.

and one pair of smaller wheels 7most of the The branch rod 29 may berigidly connectweight of the car being carried by the large ed to thebrake-beam 32, or it may have a wheels. The magnetic rail-shoe 8 issusyielding connection therewith. As shown in pended between the wheelsof the truck in the drawings, the branch rod 29 is provided 0 closeproximity to the rail by means of springs with an intermediate threadedportion on 9, attached to a bracket 10, which is supwhich are screwedthe nuts 33. The end of the rod 29 passes through an opening in thebrake-beam 32, in which it is adapted to slide, and a spiral spring 84is placed on the rod between the adjustable nuts 33 and the brakebeam.Nuts 35 are also screwed onto the end of the rod on the other side ofthe brake-beam 32. This yielding or spring connection to one pair ofwheel-shoes provides means for compensating for the unequal wear of thewheelshoes, so that the application of all the wheelshoes is alwaysassured. The wheel-shoes 31 are held toward the wheels 7 by the springs34:, so that when the brakes are applied these shoes 31 will bearagainst the wheels 7 before the wheel-shoes 27 are set against thewheels 6. Then by a further movement of the rod 25 the wheel-shoes 27are set against the wheels 6, and thus all the wheel-shoes will beeffectively applied= By this means also the force with which the brakesare applied to the small wheels may be adjusted by varying thecompression or strength of the spring. The hand brake'lever 36 ispivoted in a bracket 37, secured to the cross-piece 12 of thetruck-frame, and it is provided with a pin 38, which projects into aslot 39 in the branch rod 30. The hand brake-levers 36 are operated bythe yoke 40, connected to the pull-rod 4,1.

When the brakes are applied by hand, the pin 38 engages the end of theslot 39 and moves the rod 25, thus forcing the wheel shoes against thewheels; but when the brakes are applied by means of the magneticrail-shoe the rod 25 may slide upon the pin 38 without moving the handbrake-lever 36.

The operation of the device is as follows: Suppose the car to be movingtoward the left and the electric current be turned onto the magneticrail-shoe S. This rail-shoe will then be drawn down upon the rail and byfrictional contact will tend to drag, thus securing pull in thedirection opposite to that'in which the car is running; As the rail-shoeis supported only by the yielding springs 9, this movement will effect apartial rotation of the rockshaft 15 by means of the crank 16. The bar24 will be moved to the right by means of the lower bearing surface orpin 22 of the cam operating against the end of the slot 23, and thewheel-shoes will be applied to both pairs of wheels by the rod 25 andbranch rod 29. The first part of the movement of the bar 24 sets thewheel-shoes 31 against the wheels '7 by means of the branch rod 29 andspring 34. Then by the further movement of the bar 2+1 the spring 34 iscompressed and the wheelshoes 27 are set against the wheels 6. If therail-shoe is applied when the car is movingin the opposite direction,the rotation of the crank and shaft will also be in the oppositedirection; but in this case the upper bearing surface or pin 21 engagesthe end of the slot in bar 24: and moves the same to the right, asbefore, thus applying the brake-shoes t0 the wheels.

Some of the connecting parts such as the bar 2 cam, rock-shaft, crank,and the arm projecting from the rail -shoeare usually made of brassorsozne non-magnetic material, so as to prevent the wheels from becomingmagnetized.

The arrangement of the rock-shaft with its double cam and the slottedbar forms a compact connection between the rail shoe and thewheel-shoes, which requires but a small amount of space and operates toapply the brakes when the car is running in either direction.

I claim as myinvention and desire to secure by Letters Patent 1. A brakemechanism comprising a railshoe, wheel-shoes for the wheels, andconnections between the rail-shoe and wheel-shoes including a rock-shaftand a cam adapted to set the wheel-shoes by applying the rail-shoe.

2. A brake mechanism for cars, comprising a magnetic rail-shoe,wheel-shoes, a rockshaft adapted to be operated by the rail-shoe and adouble cam so arranged as to set the wheel-shoes by applying therail-shoe when the car is moving in either direction.

3. A brake mechanism for cars, comprising a rail-shoe, wheel-shoes, arock-shaft adapted to be operated when the rail-shoe is applied, adouble cam on the rock-shaft so arranged as to set the wheel-shoes bythe rail-shoe when the car is moving in either direction.

4. A brake mechanism for cars, comprising a railshoe, wheel-shoes forthe wheels, a rockshaft operated by the rail-shoe, a cam actuated by therock-shaft and a slotted bar connected to the wheel-shoes and to thecam.

5. A brake mechanism comprising a railshoe, wheel-shoes for the wheels,a rock-shaft having a crank connected to the rail-shoe, a double cam onthe shaft and a slotted bar connected to the wheel shoes whereby thewheelshoes are set by applying the rail-shoe when the ca is running ineither direction.

6. Abrake mechanism for cars, comprising a magnetic rail-shoe,wheel-shoes for the wheels, a rock-shaft having a crank'connected withthe rail-shoe, a double cam on the shaft and a slotted bar, in which thecam operates, connected to the wheel-shoes.

7. A brake mechanism for multiple trucks, comprising a rail-shoe,wheel-shoes adapted to be applied by the rail-shoe, and connectionswhereby the wheelshoes are set with greater force against one pair ofwheels than another by the rail-shoe.

8. A brake mechanism for multiple trucks, comprising a rail-shoe,wheel-shoes adapted to be applied by the rail-shoe, and a yieldingconnection whereby one pair of wheel-shoes is applied with greaterpressure than another pair.

9. A brake mechanism for multiple trucks, comprising a rail-shoe,wheel-shoes for the wheels, a yieldingconnection between the Wheel shoesof the different truck-Wheels, and means connected to the rail-sh0e forapplying the Wheel-shoes by longitudinal movement of the mil-shoe.

10. A brake mechanism for multiple trucks, comprisinga magneticrail-shoe, Wheel-shoes adapted to be operated by longitudinal m0vementof the raihshoe, and a yielding c011- neetion between the Wheel-shoes ofdifierent truck-Wheels.

In testimony whereof I have hereunto set my hand.

FRANK C. NEWELL. Witnesses:

R. F. EMERY, JAS. B. lVIACDONALD.

